Touch display panel and manufacturing method therefor

This application is a continuation of International Application No. PCT/CN2024/084420, filed on Mar. 28, 2024, which claims priority to Chinese Patent Application No. 202311793956.7, filed on Dec. 22, 2023. The disclosures of the aforementioned applications are hereby incorporated by reference in their entireties.

Embodiments of the present disclosure relates to the field of display technologies, and in particular, to a touch display panel and a manufacturing method therefor.

With the development of touch technology and display technology, the touch display panel has become increasingly popular. Taking a common touch-type intelligent mobile terminal as an example, a design of an increasingly high screen-to-body ratio has brought users with a more excellent visual experience than the past.

At the same time, the lightweight and thin design of the touch display panel has further received increasing attention from people.

In view of this, the present disclosure aims to provide a touch display panel and a manufacturing method therefor, and a display device to effectively reduce a thickness of stacked layers.

According to a first aspect, the present disclosure provides a touch display panel, including: a substrate; a light-emitting layer, provided on a side of the substrate and including a plurality of light-emitting units, where the light-emitting unit includes a first electrode located on a side facing away from the substrate; a plurality of isolation structures, provided on the side of the substrate with intervals, where the plurality of isolation structure are configured to define a plurality of isolation openings, the light-emitting unit is provided in the isolation opening, adjacent light-emitting units are isolated by the isolation structure, and the first electrode is electrically connected to the isolation structure; and a time-sharing control module, electrically connected to corresponding isolation structures, and configured to control a corresponding isolation structure to receive a touch signal or a power signal in a time division mode.

According to a second aspect, the present disclosure further provides a touch display panel, including: a substrate; a light-emitting layer, provided on a side of the substrate and including a plurality of light-emitting units, where the light-emitting unit includes a first electrode located on a side facing away from the substrate; and a plurality of isolation structures, provided on a side of the substrate with intervals, where the plurality of the isolation structures are configured to define a plurality of isolation openings, the light-emitting unit is provided in the isolation opening, adjacent light-emitting units are isolated by the isolation structure, and the first electrode is electrically connected to the isolation structure, and the isolation structure is configured to receive a touch signal or a power signal.

According to a third aspect, the present disclosure further provides a manufacturing method for a touch display panel, including: providing a substrate; forming an isolation material layer on the substrate; patterning the isolation material layer to form a plurality of isolation structures disposed with intervals, where the plurality of isolation structures are configured to define a plurality of isolation openings, and the isolation structure is electrically connected to a time-sharing control module of the touch display panel; and forming a first electrode of the light-emitting unit in the isolation opening, where the first electrode is electrically connected to the isolation structure.

According to a forth aspect, the present disclosure further provides a display device, including the touch display panel according to the first aspect or the second aspect of the present disclosure.

According to the present disclosure, the touch display panel includes a substrate, a light-emitting layer, a plurality of isolation structures, and a time-sharing control module. The light-emitting layer is provided on a side of the substrate and includes a plurality of light-emitting units. The light-emitting unit includes a first electrode located on a side facing away from the substrate. The plurality of isolation structures are provided on the side of the substrate with intervals, and the plurality of isolation structures are configured to define a plurality of isolation opening. The light-emitting unit is provided in the isolation opening, and adjacent light-emitting units are isolated by the isolation structure. The first electrode is electrically connected to the isolation structure. The time-sharing control module is electrically connected to corresponding isolation structures, and is configured to control a corresponding isolation structure to receive a touch signal or a power signal in a time division mode. Thus, there is no need to add an additional touch electrode film layer to achieve touch function of the touch display panel, thereby reducing a thickness of the touch display panel with preparation cost reduced as well.

Unless otherwise defined, technical or scientific terms used in the embodiments of the present specification shall have the same meanings as commonly understood by those skilled in the art to which the present specification belongs. The terms “first”, “second” and similar words used in the embodiments of the present specification do not indicate any order, quantity, or importance, but are only used to avoid confusion of constituent elements.

Unless the context requires otherwise, in the entire specification, “a plurality of” means “at least two”, and “comprising” is interpreted as open, inclusive, that is, “including, but not limited to”. In the description of the present specification, the terms “an embodiment”, “some embodiments”, “an exemplary embodiment”, “an example”, “a specific example” or “some examples”, and the like are intended to indicate that a particular feature, structure, material, or characteristic related to the embodiment or example is included in at least one embodiment or example of the present specification. The schematic representation of the above terms does not necessarily refer to the same embodiment or example.

Technical solutions in the embodiments of the present specification are clearly and completely described below with reference to the accompanying drawings in the embodiments of the present specification. Obviously, the described embodiments are only a part of the embodiments of the present specification, not all of them. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present specification without creative efforts shall fall within the protection scope of the present specification.

With a rapid development of display technologies, the touch display panel has a broad application space in the fields of vehicle-mounted, mobile phone, tablet, computer, television, and the like. Touch function has become one of standard features in most display panels, and capacitive touch display panels are widely used.

Capacitive touch display mainly includes mutual capacitive touch display and self-capacitive touch display. The self-capacitive touch display is a touch technology based on a principle of capacitive sensing, using conduction of a current on a surface of a touch display panel to detect a touch position. The self-capacitive touch display is generally applicable to a single-point touche or small amounts of synchronous touche.

Currently, a touch scheme commonly used by organic light emitting diode (OLED) display panels is in-cell, but a preparation cost and a thickness of stacked layers still need to be reduced for the in-cell touch display panel.

Therefore, the present disclosure provides a solution to effectively reduce a thickness of stacked layers of a touch display panel. A plurality of isolation openings are defined by an isolation structure, and first electrodes of a plurality of light-emitting units are provided in the plurality of isolation openings respectively, so that the first electrodes are electrically connected to each other by the isolation structure to form an electrode structure. By providing the plurality of isolation structures on the substrate with intervals, the isolation structure and the first electrode electrically connected to the isolation structure may be multiplexed as a touch electrode. Meanwhile, a time-sharing control module is electrically connected to corresponding isolation structures, so as to control a corresponding isolation structure to receive a touch signal or a power signal in a time division mode. Thus, there is no need to add an additional touch electrode film layer to achieve touch function of the touch display panel, thereby reducing a thickness of the touch display panel with preparation cost reduced as well.

Specifically, as an optional implementation of the present disclosure, an embodiment of the present disclosure provides a touch display panel.is a planar schematic structural diagram of a touch display panel according to an embodiment of the present disclosure.is a cross-sectional view of the touch display panel along a cutting line AA′ as shown in.is a schematic diagram of a connection relationship of structures of a touch display panel according to an embodiment of the present disclosure. As shown in,and, the touch display panel may at least include: a substrate, a light-emitting layer, a plurality of isolation structures, and a time-sharing control module F.

The substrateis mainly used for supporting and load-bearing. Specifically, the substratemay be a rigid substrate such as a glass substrate or a silicon substrate, as well as a flexible substrate such as a stainless use steel (SUS) substrate or a flexible polyimide (PI) substrate. That is to say, the display panel in this embodiment may be a non-bendable rigid display panel or a bendable flexible display panel.

The light-emitting layeris provided on a side of the substrateand includes a plurality of light-emitting unitsA. The light-emitting unitA includes a first electrodelocated on a side facing away from the substrate.

The isolation structuresare provided on the side of the substratewith intervals, and the plurality of isolation structuresare configured to define a plurality of isolation openings K. The light-emitting unitA is provided in the isolation opening K, and adjacent light-emitting unitsA are isolated by the isolated structure. The first electrodeis electrically connected to the isolation structure.

The first electrodemay be a cathode.

A plurality of first electrodesare located in the plurality of isolation openings K, and the isolation structureis electrically connected to the plurality of first electrodes. It can be seen that the plurality of first electrodesare electrically connected to each other by the isolation structure, so that each of the plurality of isolation structuresand the first electrodeelectrically connected to the isolation structuremay serve as an independent electrode structure, and provide a structural basis for multiplexing the independent electrode structure as a touch electrode.

In implementation, each isolation structureand the first electrodeelectrically connected to the isolation structureare multiplexed as a touch electrode. Thus, the plurality of isolation structuresprovided on the substratewith intervals and the first electrodeselectrically connected to the isolation structures, that is, a plurality of touch electrodes provided on the substratewith intervals, may achieve self-capacitive touch display of the touch display panel.

Meanwhile, it may be avoided to additionally prepare a touch electrode layer by multiplexing the isolation structureand the first electrodeselectrically connected to the isolation structureas a touch electrode, thereby reducing a thickness of stacked layers of the touch display panel, saving a quantity of mask plates, and reducing a preparation cost.

International Patent Application No. PCT/CN2023/134518 and Chinese Patent Applications including No. 202310759370.2, No. 202310740412.8, No. 202310707209.0, and No. 202311346196.5 describe a related art of an isolation structure, and the contents thereof are incorporated by reference in the present application for reference.

As shown in, the time-sharing control module F is electrically connected to corresponding isolation structures, and is configured to control a corresponding isolation structureto receive a touch signal or a power signal in a time division mode.

It should be understood that the first electrodemay be a cathode, and correspondingly, the power signal may be a cathode signal.

The time-sharing control module F is used to control the corresponding isolation structureto receive the touch signal or the power signal, that is, a touch function and a display function of the touch display panel may be switched by using the time-sharing control module F, both ensuring achievements of the display and touch functions of the touch display panel and reducing the preparation cost.

In actual application, the plurality of isolation structuresmay be provided on the substratewith intervals, so that the arrangement of the touch electrodes is more uniform, avoiding touch failure or poor touch effect in part of the touch display area due to sparse distribution of touch electrodes.

In order to ensure achievements of the touch function and the display function of the touch display panel respectively, in some embodiments, as shown inand, the substratemay include a driving circuit layer, the driving circuit layerincludes a plurality of pixel driving circuits. A power signal terminal of the pixel driving circuitis electrically connected to an isolation structurecontrolled by the time-sharing control module F, to send a power signal to the first electrodeby the time-sharing control module F.

Specifically, as shown in, the power signal terminal of the pixel driving circuitis electrically connected to the isolation structurecontrolled by the time-sharing control module F through the time-sharing control module F, and is configured to provide the power signal to the time-sharing control module F, to send the power signal to the corresponding isolation structureby the time-sharing control module F.

In some embodiments, as shown in, the time-sharing control module F may include a plurality of selection circuits. The power signal terminal of the pixel driving circuitis electrically connected to the isolation structurecontrolled by the selection circuitthrough the selection circuit, to provide the power signal to the first electrodeby the selection circuit.

In this way, when the power signal is received, the first electrodemay cooperate with other structures of the light-emitting unitA to achieve the display function of the touch display panel.

In some embodiments, as shown in, the time-sharing control module F may further include a control chip. The control chipis configured to provide a touch signal to a corresponding selection circuit, to provide the touch signal to the first electrodeby the selection circuit.

In this way, when the first electrodereceives the touch signal, the first electrodesand the isolation structureelectrically connected to the first electrodesmay serve as a touch electrode to achieve the touch function of the touch display panel.

In actual application, the control chipmay further be electrically connected to the light-emitting unitA through the pixel driving circuitto apply a driving signal to the light-emitting unitA by the pixel driving circuit.

In implementation, the pixel driving circuitmay include at least one of pixel driving circuits of a 2T1C structure, a 7T1C structure, a 6T1C structure, and a 3T1C structure pixel driving circuit. T represents a transistor, and C represents a capacitor.

Similarly, the plurality of isolation structuresand the first electrodeselectrically connected the isolation structuresmay not only serve as a plurality of touch electrodes to achieve the touch function, but also may further serve as first electrodesof the plurality of light-emitting unitsA to achieve the display function. As the plurality of isolation structuresand the first electrodeselectrically connected the isolation structuresserve as the touch electrodes and the first electrodes, the touch signal received by the touch electrodes and the power signal received by the first electrodesare not same. Therefore, in order to avoid mutual interference between the touch and the display functions, in some embodiments, a control timing of the control chipmay include a touch timing segment and a display timing segment.

The touch timing segment and the display timing segment are non-overlapping timing segments.

Specifically, the selection circuitis configured to send a touch signal provided by the control chipto an isolation structurecorrespondingly connected to the selection circuitin the touch timing segment, and is configured to send a power signal provided by the pixel driving circuitto the isolation structurecorrespondingly connected to the selection circuit in the display timing segment.

In this way, in the touch timing segment, the plurality of isolation structuresonly receive the touch signal provided by the selection circuit, so as to serve as a touch structure for implementation of the touch function; and in the display timing segment, the plurality of isolation structuresonly receive the power signal provided by the pixel driving circuit, that is, the first electrodeonly receives the power signal, ensuring a cathode function of the first electrode, to serve as a display structure for implementation of the display function. The touch timing segment and the display timing segment are executed separately, thereby ensuring that the touch function and the display function are executed separately, avoiding an interference between implementation of the touch function and implementation of the display function, and ensuring touch effect and display effect.

In order to ensure that the selection circuitmay provide the touch signal in the touch timing segment and the power signal in the display timing segment, in some embodiments, as shown in, the selection circuitmay include a first inputting terminal, a second inputting terminal, and an outputting terminal. The control chipis configured to control conduction between the first inputting terminaland the outputting terminal, and conduction between the second inputting terminaland the outputting terminalseparately through a control signal line.

Specifically, in the touch timing segment, the control chipis configured to control the conduction between the first inputting terminaland the outputting terminalthrough a first control signal line S, and provides a touch signal through a first connection line.

In the display timing segment, the control chipis configured to control the conduction between the second inputting terminaland the outputting terminalthrough a second control signal line S, and provides the power signal through a second connection line.

The first inputting terminalis connected to the control chipthrough the first connection line. A touch signal is provided to the first inputting terminalby the control chip. The second inputting terminalis connected to the pixel driving circuitthrough the second connection line. A power signal is provided to the second inputting terminalby the pixel driving circuit. The outputting terminalis connected to an isolation structurecorrespondingly connected to the selection circuit.

The driving chipmay be specifically configured to provide the touch signal through the first connection linein the touch timing segment.

The pixel driving circuitmay be specifically configured to provide the power signal through the second connecting linein the display timing segment.

The selection circuitmay be specifically configured to conduct the first inputting terminaland the outputting terminalin the touch timing segment, to output the touch signal to a corresponding isolation structurethrough the outputting terminal. And the selection circuitmay be configured to conduct the second inputting terminaland the outputting terminalin the display timing segment, to output the power signal to the corresponding isolation structurethrough the outputting terminal.

In order to better achieve conduction and disconnection between the first inputting terminaland the outputting terminaland between the second inputting terminaland the outputting terminal, in some embodiments, as shown in, the selection circuitmay further include a first switch unitand a second switch unit. The first inputting terminalis connected to the outputting terminalthrough the first switch unit, and the first control signal line Sis connected to a control terminal of the first switch unit. The second inputting terminalis connected to the outputting terminalthrough the second switch unit, and the second control signal line Sis connected to a control terminal of the second switch unit.